I bought one to see exactly what kind of foam it was. I wanted to do the technique for a quild class. The foam is not the Styrofoam I was use to. It's very smooth and dense. It is made like the Pink Panther insulation foam which is very expensive and hard to find in the right thickness for the project. Trying to find the right carbon paper and foam it was easier and less expensive to buy the supplies directly from the website. I tried the regular Styrofoam and the fabric didn't look or hold fabric as smooth as as the kit foam. Here is the website I ordered from:
http://quilt-magic.com/cgi-bin/store/QLTstore.cgi